Superheater for locomotive-boilers.



J( PRIMROSE. SUPERHBATBR FOR LoGoMoTIvB BOILBRS.

APPLICATION FILED MAB.. 9. 1911.

Patented Apr. 29, 1913.

JOHN PRIMROSE, OF NEW YORK, N. Y.

SUPERHETER FOR LOCOMOTIVE-BOILERS.

Specification of Letterslatent.

Patenten apr., as, reis.

Application led March 9, 1911. Serial No. 613,349.

To all whom t may concern Beit known that I, JOHN PRIMRosE, a subject of the King of Great Britain, residing at New York, in the county and State of New York, haveI invented certain new and useful Improvements in Superheaters for Locomotive-Boilers, of. which the following is a full, clear, and exact description.-

This invention relates to steam superheating apparatus for boilers or generators of the locomotive type, and its chief object is to provide an eiiicient superheater for the purpose and to so arrange the same in the smoke box of the boiler as to occupy the minimum space, with the least possible interference with the draft.

A further object is to provide eective means for an adequate 'supply of the fur- 4nace gases to the superheater without impairment of the steam-generating capacity of the boiler.

To these and other ends the invention consists in the novell features of construction and combinations of elements hereinafter described, and more particularly set `forth in t-he appended claims.

The preferred embodiment. of the invention is illustrated in the accompanying drawings and will now be described more however, that the invention is capable .of

other embodiments without departurerom its proper spirit and scope.

ln the drawings, Figure 1 is a horizontal and vertical section through the smoke box of a locomotive boiler.r Fig. 2 is a sectional nlan view, half on line 2L- a andr half on tline 2"--2b of- Fig. 1. Fig. 3 is av front'view, half with merely the front of the smoke box removed and half substantiaily on line 3 3 of Fi 1.

The smoe box 10 is in the usual position at the front end Avof the boiler," 11, and has a forwardly convex iront wall 12, and a., rear wall 13 formed by the front tube-sheet or' the boiler. the front ort the smoke box, each side, are two curved headers, 1&1-, 1o, the inlet headers ifi bei onnected their upper ends by conduits 16 te the ends a transverse conduit?? which is norme at its center to a supplypioe 13 leadii ,j rom a convenient point in the steam space of the The outlet heee 15, are conn t their lower i or less 1n detail. lt should be remembered,

not shown. rlhe headers on each side of the smoke box are securely supported by bolts 14a extending through suitable lugs 14h on the headers. The lnlet headers are connected to the respective outlet headers by rearwardly extending U-shaped superheating tubes 20, the rear ends of which are supported by a transverse plate or partition sheet 21 spaced a short distance in front of the outlets of the fire-tubes or boiler-fines 22. This sheet 21 has an opening 23 inside the headers, and extending forwardly from this opening, into juxtaposition to the bulging front wall of the smoke box is a wide conduit 24'. It will therefore be seen that the furnace gases ydischarged by the boiler-dues can pass directly to the smoke stack 25 by way of the conduit 24 and the space 26 between the sheets 13 and 21. Extending downwardly and forwardly from `the top of the openin 23 is a baiiie 27, with similar bafies, one o which is shown at 28,v .(not shown in Figs. 2 and 3), extending downwardly and inwardly from the sides of the conduit 24; the purpose of these bailies being to deflect the furnace gases into proximit to the orice of the engine-exhaust nozz e 29. The latter extends slightly above the lower edge of the baes, into proximity to a bell 30 depending from the stack 25. By the arrangement 'described the draft produced by the ejector action of the exhaust nozzle 29 and the bell 30 is markedly increased.

For' the purpose or su l in hi hl heated gases fromrthe furnalcig 'gb the suneryi heaters, whichlatter arek inclosed in the chamber formed by the sheet 21, the conduit 24, and the outer, cylindrical wall of the smoke box, two dues, 31, 32, are provlded heading directly from the furnace (not shown) to the superheating chamber, below the conduit 2d. rlhe gases conveyed by these superheating dues are discharged tromv the open `ends of the rines and also through lateral apertures 33: l

ln practice the dues 31, 32 terminate prefA erably at about the center orQ the smoke box, and it is also preferred to-make the forvvar portions et such fines of cast iron, connecting them 'to the rearward portions oat the dues at the tube-sheet 13. The rines just named are oit relativ/ely large diameter, so that heat e itting surface in contact with the contents the boiler 'll be smaller proportion to their vc f capacity' than in the case of the boiler-flues or lire-tubes 22. The consequence is that less heat .will be lost in transit through the b'oiler, and hence the furnace gases will arrive at the superheaters with correspondingly higher temperatures.

Discharged from the flues 31, 32, the highly heated furnace gases flow laterally and upwardly among the superheating tubes, a small proportion of the gases finding their way into the conduit 24 through the open forward end thereof while the major portion enters said conduit through an opening 34 in the top, controlled by a damper 35 which may be operated manually from the engine cab (not shown) by any suitable means such asthat indicated more or less `diagrammatically at 36. From the conduit 24 the superheating gases enter the stack along with the gases from the firetubes 22. l V

. From the foregoing it will be seen that the flow of gases from the boiler fiues to the stack is in no way interfered with by the pressure of the superheaters, as said gases do not enter the superheating chamber but pass directly to the stack by way of the passage afforded between. the sheets 13 and 21 and by the conduit 24. On the other hand, furnace gases at high temperature are supplied to the superheating chamber Yby the superheating flues 31, 32, and after flowin over the superheating tubes mingle with t e gases in the conduit 24 and flow thence to the stack. The net 'result of th'ese improvements is a marked efficiency of operation, an adequate degree of superheat being obtained without impairing the draft or the steam-generating capacity of the boiler.

As previously stated, the construction herein specifically shown and described is merely the preferred form of the invention, which may be embodied in other forms without departure from its proper spirit andy scope.

l claim:

1. ln a steam superheater, the combination of a boiler, asmoke box associated therewith having a longitudinal chamber through which the fire tube gases pass directly to the atmosphere, a superheater chamber in said smoke box, the rear wall of which is 'located forwardly from the rear wall of the smoke box, whereby the longitudinal chamber is enlarged at the rear without enlarging the smoke-box to permit a free flow of gases from the fire tubes to the smoke stack, and means for; delivering hot gases directly from the furnace to the superheater chamber.

2. In a steam superheater, the combination of a boiler, a smoke box associated therewith having a longitudinal chamber therein through which the lire tube gases pass directly to the atmosphere, a superheater chamber in said smoke box concentric with the aforesaid chamber, the rear wall of which is located forwardly from the rear wall of the smoke box whereby the longitudinal chamber is enlarged at the rear without enlarging the smoke box to t a free flow of gases directly from the fire tubes to the atmosphere, a superheater in said' superheater chamber having the elements longitudinally arranged therein, and means for delivering hot gases directly from the furnace and discharging the same laterally among said superheat-ing elements.

3. In a steamY superheater, the combination of a boiler of the locomotive type, a smoke box associated therewith, superheating elements at the sides of the smokebox, and superhe'ating flues extendingufrom the boiler into the smoke box and perforated at the sides thereof and` discharging laterally upon the superheating elements.

4. In a steam superheater, the combination of a boiler of the locomotive type, having fire-tubes, a smoke box associated therewith, a longitudinally extending conduit receivingI furnace gases from the said firetubes, superheating elements at the sides of the smoke box between the walls thereof and the said conduit, means to laterally discharge furnace ,gases from said conduit upony i said super-heating elements, and superheating iiues extending from the boiler into the space below the said conduit, for supplying highly heated furnace gases to said superheating elements.

5. n a steam superheater, the combination of a boiler of the locomotive type, a smoke box associated therewith, inlet and outlet headers inthe front of the smoke box at the sides thereof, a transverse conduitat the rear of the smoke box, lon tudinally extending conduits connecting t e transverse conduit to the inlet headers, means for conveying steam from the boiler to .the transverse conduit, rearwardly extending superheating tubes conne'ctin the inlet headers to the respective outlet caders, and rearwardly extending conduits for conveying superheated steam from the outlet headers.

6. lln a steam superheater, the combination of a boiler of the locomotive type, a smoke box associated therewith, a partition sheet extending across the smoke box in the rear portion thereof and having an opening, a conduit for furnace gases extending forwardly from said opening, headers at the front of the smoke box between said conduit and the walls 0f the smoke box, rearwardly extending superheating tubes connected toy the headers and supported at their ends by the partit-ion sheet, and means for discharging superheati'ng gases upon the superheating tubes.

7 n a steam superheater, the combination of a boiler of the locomotive type having fire-tubes, a smoke box associated with the boiler, a smoke stack, central longitudinally extending conduit for conveying gases from the tire-tubes to the smoke stack and having an opening in its top, super-- heaters comprising tubes at the sides of the smoke box between the walls thereof and the said conduit and arranged substantially parallel to said conduit, and a pair of superheating lues of relatively large diameter extending from the boiler into the space bef low the conduit forl laterally discharging highly heated gases upon the longitudinally arranged superheating tubes.

8. In a steam superheater, the combination of a boiler of the locomotive type, a smoke box associated therewith, a longitudinal chamber centrallyi located in said smoke box whose upper side is apertured and the rear end ofv which is open to receive the furnace gases directly from the fire tubes, a superheater chamber closed from the tire tubes and from the exterior of the cmoke box, means for `directly discharging hot furnace gases into said superheater chamber and laterally yamong said superheater elements, the gases from the said last mentioned chamber adapted to pass therefrom into the first ment-ioned` chamber by way of the aperture therein, and means for discharging the fire tube and superheater -gases from the first mentioned chamber into the atmosphere.

9. In a .steam superheater, the combination of a boiler of the fire tube type, a smoke box associated therewith having a longitudinal perforated chamber therein through t which the fire tube gases pass directly to the from the fire tubes to the smoke stack, means' for delivering hot gases from the furnace to the superheater chamber, said furnace gases after traversing said superheater chamber adapted to pass through the perforation into the longitudinal chamber, an ejector in the longitudinal chamber for discharging the gases from the same into the smoke stack, andk means for. detlecting the fire tube and superheating gases in proxim` i ity to the .orifice of the ejector.

In testimony whereof I affix my signature in the presence of two subscribing witnesses.

JOHN P'RIMROSE.

Witnesses LAwsoN DYER, WM. BOHLEBER. 

